Roll ANGLE 705a919..60e6edf

https://chromium.googlesource.com/angle/angle.git/+log/705a919..60e6edf

BUG=chromium:655534,chromium:659472,chromium:660670

TBR=kbr@chromium.org

TEST=bots

CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.win:win_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2470533002
Cr-Commit-Position: refs/heads/master@{#428839}

DEPS

@@ -51,7 +51,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling ANGLE
   # and whatever else without interference from each other.
-  'angle_revision': '705a9194438dd19a2f456235dda5a175cfce94d5',
+  'angle_revision': '60e6edfa7fe2549c8e60fec84d3af225e185a85d',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling build tools
   # and whatever else without interference from each other.